Combined centering calipers and square.



HfH. HEINTZELMAN. COMBINED GENTERING CALIPBRS AND SQUARE.

APPLICATION FILED JUNE 19, 1912.

1,066,273. Patented Ju1y1,191s.

. WHY/muon 1% M" mym COLUMBIA PLANO0R-APH` C0., WASHINGTON. uA c HARVEYH. HEINTZELIVIAN, OIE' MALTA, oHIo.

COMBINED CENTERING CALIPERS .AND SQUARE.

Specification of Letters Patent.

Patented July 1, 1913.

Application led J'une 19, 1912. Serial No. 704,593.

T0 all whom i?? may concern.'

Be it known that I, HARVEY H. HEINTZEL- MAN, a citizen of the UnitedStates, residing at Malta, in the county of Morgan and State of Ohio,have invented new and useful Improvements in Combined Centering Calipersand Squares, of which the following is a specification.

This invention is an improved combined centering caliper and square, theobject of the invention being to provide an improved instrument of thiskind which may be used both as a caliper and as a square and which alsoserves to indicate the center of any object measured thereby, theinvention consisting in the construction, combination and arrangement ofdevices, hereinafter described and claimed.

In the accompanying drawing Figure 1 is an elevation of a combinedcaliper and square constructed in accordance with my invention. Fig. 2is a longitudinal sectional view of the same. Fig. 3 is a transversesectional view of same on the plane indicated by the line w-a of Fig. 1.Fig. 4 is a similar view o-n the planeindicated by the line -b of Fig.1.

In accordance with my invention, -I provide a pair of squares 1 2. Thesquare 1 has its long arm 3 provided with a longitudinal channel 4 openat one side of the said arm and one side of the said arm is providedwith a longitudinal slot 5. In the bottom of the channel in the arm 3 isa rack G and one side or wall of the said arm is provided on its innerside with a longitudinal tongue 7. The long arm 8 of the square 2operates in the guideway or casing formed by the channeled long arm ofthe square 1 and is provided in one side with a groove 9 which isengaged by the tongue 7 and is also provided on its inner edge with arack 10 which is opposite and spaced from the rack 6 o-f the arm 3.Hence, the square 2 is slidably connected to the square 1 so that theshort arm 11 of the square 2 may be moved toward and from the short arm12 of the square 1 and the short arms of the squares of the instrumentmay hence be employed as calipers for measuring the bottom or width ofthe object.

The long arm 3 of the square 1 is provided on the same face which hasthe slot to operate on this scale, between the arms 11' 12 of thesquares and this pointer is carried by a bar 15 which operates in theslot 5 and is provided on one side, at its outer end, with a pinion 16which is arranged between and engages the racks 6-10- Owing to the factthat the pinion of the longitudinally movable bar 15 which carries thepointer, engages the racks of both o-f the squares, when one of thesquares is moved longitudinally toward and from the other, the bar 15with its pointer 14 moves only half as far and hence the pointer 14 isat all times midway between the arms 11-12 of the instrument so that thepointer serves to indicate the exact center of any obj ect measuredbetween the arms 11-l2, as will be understood.V The bar 15 is held inplace in the slot 5 by the pointer 14 which bears on the outer side ofthe slotted wall of the arm 3 and a. cross head 18 which bears on theinner side of said wall.

While I have herein shown and described a preferred form of myinvention, I would have it understood that changes may be made in theform, proportion and construction of the several parts without departingfrom the spirit of my invention and within the scope of the appendedclaim.

I claim A combined caliper and square comprising a pair of members eachof which forms a square, one of said members having a hollow arm and theother having one arm slid- 'ably mounted in said hollow arm, said armsof the squares being provided with opposing spaced racks and Jthe saidhollow arm having` a longitudinal tongue on the inner side of one of itsside walls, the corresponding arm of the other square having alongitudinal groove engaged by said tongue, a centering member slidablymounted in the said hollow arm and having a pointer, and a pinioncarried by said centering member and arranged between and engaged by theracks.

In testimony whereof I aflix my signature in presence of two witnesses.

HARVEY H. HEINTZELMAN. Witnesses:

FLORA B. SHARPE, GEORGE W. SHARPE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

